Spring for shock absorbers



1,642,058- s. H. BISHOP ET AL v SPRING FOR SHOCK ABSORBERS Sept. 13,1927.`

Filed Jun 1e. 1924 A TTORNE YS.

Patented Sept. 13, 19277.

UNITED STATES vPartnr OFFICE.

STANLEY HOWARD BISHOP AND NORRISNONMCNAUGIIT, or OIIIOAGO, ILLINOIS, As'- sIGNoRs, BY DIRECT AND. MESNE ASSIGNMENTS, To OROSSMANUFAC'IURING COM- PANSQOF woons'roon, ILLINOIS, A CORPORATION or ILLINOIS.

SPRING FOR SHOCK ABSYOBBERS.

` V'Applicraton led June 416, 1924. Serial lid-720,391.

which is so constructe'das to eliminate the tendency of the spring tocrystall-ize and break aty its work engaging ends. This is accomplishedby bending the outermost ends of the spring` about yits'aXis in the opposite direction to which thefspring is normally coiled.- jIt is obviousftha't this construction greatly prolongsthe' lifefof the spring, and

there-forethe useful life ofltljie-shock absorber, Off which yit is apart. A, *L i*A'furtherobject,ofourinvention is' t0 puy videfai'spring forshockfabsorb-ers andv the'y like: which'fis reversible' and y therefore `which greatly facilitates'thejmanual 'process of.vv assembling ofthe shock i absorber," of which the spring vis apart.'` Ordinarily itis necessary' to place'the spring in atp-predetermined 'position vduring 'the process of assembling. use'of our improved[springthe spring A' Vmay be dropped vin the spring actuated drum I'By and revolved lin a clockwisedirection, whereupon it will properly engage withthe drum.

In a like m`annerthe spring'engagi-ng mem-f berf'for the opposite end ofthe spring is engaged therewith by rotating 'that member inr a clockwise direction, relative-to f theA Spline, f

A further` object of ourl invention is Ito provide a spring fOrshock-absorbers and the like that is durable in construction, may be manufactured economically, and is eflicient for the purpose intended.

Other objects and advantages'will appear in the following specification, and the novel features of the invention will be particularly pointed outJ in the appended claims.

Our invention is illustrated in the accompanying drawings forming a part of this application in which f p Figure 1 is a sectional view through a shock absorber, showing our improved spring in sectionon the line 1 1 of Figure 2.

Figure 2 is a sectional view along the line 2 2 of Figure 1, and

Figure 3 is a perspective view Vof our improved shock absorber spring. v

In carrying out our invention We make use of a casing 1 arranged for support by means of a bossy 2, vand bolt 3, upon thechassis of a motor vehicle, .adjacent to the aXle of the vehicle, depending upon` the particular installation of the device.

A strap 4 is secured to the innermost wall of the base of the casing 1,. This strap 4 is bent forwardly at 5 so as to extend into the center of. the casing parallel with the axis thereof.l A cup-shaped member 6is secured to the strap 4 by the 'proj ection therethrough of the reduced portion 7 of ay stationary shaft Y 8, which is rivetedfdirectly'to the vstrap 4. This shaft is yarranged to `extend through the frontwall 90f thecasing. l.

Al hollow drumglO is rotatably-mounted` upon the shaft 8 by means of a bearing-por- 'tioir 11, fbeing tubularin construction. A

fabricbelt vorstrap l2 .is coiled about the;

ldrum 1Q and is vpermitted to projectthrough an opening 13m the side wall of the casing 1; l Thelowermost end 14Of` this strap is secured to the adjacent 'axle shaft of the vehicle.

rThe subject of our invention is a torsion spring 15 disposedk within the drum 10and provided for the purpose of causing the drum 10 torewind the strap 12 thereupon when the chassis of the vehicle moves toward the axle, as in thecompre'ssion' of the vehicle springs,.and also 'to restrict the movement of` the unwinding strap- 12 from the drumV 10 g as it is drawn over a function portion 16 of the casing 1 (see Figure 2).

*This springfl is rmorefclearly shown in Figure 3, andV is vconstructed Vof arhigh qual! ity of steel, having each end thereof bent to form a hook portion 17. `The ends of the spring 15 are further bent parallel with the Y coils of the spring, but extending in a direction opposite thereto. The portion 18 of the spring is arranged to encompass the v cup-shapedmember 6, an dthe bearing member 11, respectively, while Ythe hook member 17 is arranged to engage with the inwardly extending member 5 of the strap 4 and the boss 19 in the inner wall of the drum 10, respectively.

From the foregoing description of the various parts of the device the operation thereof may be readily understood.

One of the important advantages of our improved spring is that the spring is easily assembled in the shock absorber, rst, be

'cause it is not k necessary to place the spring lll portion ot the assembling is then complete.

The paramount advantage possessed by our improved spring is that the spring effectirely resists the tendency ilound in the ordinary type ot' spring to erystallize and break at the Work engaging ends. lVere it not for the portion 18 actuation of the spring many successive times would tend to bend the outer-most portion of the spring contiguous With the major portion of the spring, and .in this constant application ot force to straighten the spring crystallization would take place, which would eventually result in the breaking o'l': the hoop portion ol the spring.

Tith our present improvement, however, the portion 1S, which is Wrapped about the cupvshaped member G and the tubular niember 1.1, respectively, eilectually resists all tendency to straighten the hook portion ot the spring, thereby imparting force, as by rotating the drum 10 direct to the major portions oit the spring.

It u'ill be apparentthat by eliminating this tendency to straighten the spring by the hook shaped portion, that we have greatly lengthened the etlective life oi" thc spring, and consequently the useful life of the shock absorber, ot' which the spring is a part.

l'u referenceto Figure 2, it will be noted that the portion 18 of the spring 15 is stretched somewhat, due to engagement thereot1 with the cup shaped* member G.

Thus the portion 1S is in close engagement with the cup shaped member G, and the portion 18 at the opposite end of the springis in engagement with the portion 11 at all times during the operative engagement oi the spring with the drum andcap shaped member 6.

lVe claim:

1. In a shock absorber, the combination ot a supporting plate, an anchor plate rivetted to said supporting plate and having a shaft supported thereby, a cup-shaped drum haring atubular hub therein supported on said shaft with its open end toward said plates, a lug on said anchor plate projecting into said1 drum, a similar lug projecting from the bottom of said drum, and a helical spring about said hub and having each end bent about one of said lugs Without sharp curvature and extending backwardly about said hub to 'form a guide for said spring, said lugs being located substantially midway between said sha'lit and the helix of said spring.

2. In a shock absorber, the combination ot a supporting plate, an anchor plate rivetted to said supporting plate andhaving a shaft supported thereby, a cup-shaped drum having a, tubular hub therein supported on said shaft with its open endA toward said plates, a lug on said anchor plate projecting into said drum, a similar lug projecting Ytrom the bottom of said drum, a helical spring about said hub and having each end bent about one of said lugs Without sharp currature and extending backwardly about said hub to form a guide for said spring, said lugs being located substantially midway between said shaft and the helix of said spring, and a cup-shaped retaining member supported on said shaft against said anchor fplate to provide an anchor 'for said spring When tensioned.

NORRIS `FON MCNAUGHT., STANLEY HOVARD BISHOP. 

